/Engine/Source/Runtime/UMG/Public/Blueprint/UserWidget.h
Plays an animation on this widget relative to it's current state forward. You should use this version in situations where say a user can click a button and that causes a panel to slide out, and you want to reverse that same animation to begin sliding in the opposite direction.
[UUMGSequencePlayer](API\Runtime\UMG\Animation\UUMGSequencePlayer) * PlayAnimationForward ( [UWidgetAnimation](API\Runtime\UMG\Animation\UWidgetAnimation) * InAnimation, float PlaybackSpeed, bool bRestoreState )